Date: Thu, 18 Mar 2010 20:23:00 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: freebsd-geom@FreeBSD.org Subject: 7.3-RC2 - fdisk cannot write or modify sector zero on gmirror - GEOM bug? Message-ID: <4BA27D94.4060508@quip.cz>
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I sent this message with subject "Geom not found: "gm0" / Failed to write sector zero" to the freebsd-stable list a week ago, but nobody replied. I did some tests - more on the end of this message. --------------------------------------------------- I just installed 7.3-RC2 amd64 on new server. I created slice s1 (80GB on disk ad4 (500GB), then partitions for system (/, swap, /var, /usr, /tmp) by sysinstall. After base install I created gmirror gm0 as usual (I did it many times). Now I am no longer in datacenter and have only ssh access to this server and I need to create slice s2 with some partitions for data storage, but fdisk failed. fdisk -u /dev/mirror/gm0 At the end, I got this error: Should we write new partition table? [n] y fdisk: Geom not found: "gm0" fdisk: Failed to write sector zero Fdisk failed even if I used sysctl kern.geom.debugflags=16 Question #1 - why 'Geom not found: "gm0"'? Question #2 - is there any way to create slices + partitions on unused space if system is booted from this device? Or is the only way to boot it from some LiveFS / fixit? I found the same question on this list, but without reply http://lists.freebsd.org/pipermail/freebsd-stable/2009-June/050855.html I hope somebody can help / explain it. --------------------------------------------------- Some newer tests. Today I tried it with 7.2 RELEASE under QEMU without gmirror and there is not any problem to write sector zero on to /dev/ad0 I can resize ad0s1 by fdisk with sysctl kern.geom.debugflags=16 (system is booted from ad0s1a) and I can create ad0s2 without any problem. But this is impossible on gmirror with 7.3-RC2. It seems as some bug in GEOM / gmirror for me. Can somebody with GEOM knowledge take a look at it? Miroslav Lachman
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